The Anchor Bend is actually a hitch: it is used for attaching a rope to an object, such as an anchor ring. It can hold rather heavy loads and doesn’t jam under strain. That is why it has always been a traditional knot for tying an anchor line to an anchor. For additional security pull the knot tight or seize the ends with a twine.
ABoK #1723, #1841
Pass the rope through the anchor ring from behind.
Pass through anchor ring once more in the same direction.
Continue under the standing part and through the 2 loops.
Pass under the standing part, then over it through the loop, making a half hitch.
Seize the ends with a twine and tighten the knot.
The Anchor Bend is complete.